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Question

Methane on complete combustion gives a _______ flame.

A
blue
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B
yellow
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C
red
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D
green
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Solution

The correct option is A blue
Methane gas (CH4) is highly inflammable. It burns by reacting with oxygen to give a clean blue flame. During this reaction carbon dioxide (CO2) and oxygen (O2) gases are released.

CH4(g)+2O2(g)CO2(g)+2H2O(g)+heat

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